MAI.AC08TRACA. III. 



14. Haploniscus spinifer n. sp. 

 (PL II, figs.3a-3h.) 



Description. This species is so closely allied to //. biciu/>is, that it is sufficient to point out 

 the 1 1 (ft tmces. -- The antennuhe with only 4 joints in the flagellum (fig. 3 a). The antenmc have the 

 process on third joint nearer to its base (fig. 3C) than in //. bicuspis\ in both sexes the last joint of 

 tin- peduncle has an oblong tooth or acute process above at the distal end (figs. 3 83 b), and the 

 i-lluni has only n joints. The median lamella of the male operculum (fig. 3 f ) is only about half 

 as long again as broad at the base, the proximal part of the outer margin somewhat convex without 

 the im-i -inn found in //. tifttsfis, and the terminal part of the lamella has its lateral margins convex, 

 without any protruding angle. 



Two adult males from the same place (Stat 22) differ considerably from one another; one is 

 shaped as the male figured of //. bicus/>is (fig. 2 a), but its postero-lateral processes are much larger 

 (fig. 3 d), each being half as long again as the posterior margin between them. The other male looks 

 almost like a female, as the lateral margins of the body are more convex, and the animal consequently 

 broader in proportion to length, furthermore the antennulae and antennae are distinctly more slender, 

 and the postero-lateral processes (fig. 36) much shorter, being even shorter than the margin between them. 



The largest male measures 2-8 mm. from the front margin to the end of the very long postero- 

 lateral processes. No female with marsupium was secured. 



Remarks. The process at the end of the antennal peduncle is the best character between 

 //. sftni/fr and //. bicusf>is. as the latter species has no trace of any process. A second allied species 

 without any process at the end of the antennal peduncle is //. rctrospinis Richardson, of which I have 

 examined co-types from the U. S. Nat Mus. 



Occurrence. Taken by the "IngolF at three stations, all in the warm area. 



Davis Strait: StaL 36: LaL 6i5o' N.. Long. s62i' W., 1435 fath., temp. 1-5; 4 spec. 



South of Davis Strait: StaL 22: LaL 58io' N., Long. 4825' W., 1845 fath., temp. 1-4; 4 spec 



South-West of Iceland: StaL 78: LaL 6o37' N., Long. 2752' W., 799 fath., temp. 4-5; 11 spec., 



but most of them very young. 



Haploniscus armadilloides n. sp. 



(PI. 1 1, figs. 4 a-4d). 



Female. Body about two and a half times as long as broad, rather convex, and the major 

 part nearly semi-cylindrical; the general appearance reminding one of a minute Armadillo. The sides of 

 the head somewhat expanded outwards and forwards, so that the anterior margin, which has its median 

 part somewhat convex (figs. 4 a 4 b), is conspicuously concave between the middle and the broadly 

 rounded antero-lateral angles. The frontal plate (fig. 4 b) is a rather broad triangle with the apex 

 acute and each lateral margin sinuate. Antennulae about as long as the head; flagellutn shorter than 

 the peduncle, 3-jointed (fig. 4 b). Anu mix short, reaching about the posterior angle of first thoracic 

 segment; the first joint could not be made out; the process on third joint is extremely long, slender, 

 acute, projecting outwards and a little forwards from the anterior side of the joint, and reaching to 

 near the end of fifth joint; flagellum a little shorter than the peduncle, 7-jointed. 



